I think most people (Including me) have an issue with people saying they are doing fine, when it is their lack of perspective that skews the experience.
As a warlock, you are going to be lowest on the meters against most other specs. Saying you are doing decent as a warlock is just not true, since you would have to perform at 1% lvl to be decent, and I very much doubt that anyone saying warlocks are fun and fine are part of the people who perform at the top 1% level.
Relative to your group you may be doing fine, but don't say you are doing fine in general. "I did a heroic and I easily topped meters, locks must be fine" vs "I did a heroic, I had fun, I topped meters so I guess the others were undergeared / bad". I'm just not really in the mood to be told that warlocks are great right now, because they are not.
Least interesting, most clunkiness, no baseline interrupt, tanky caster idea (Which is just going to be crap), all 3 specs performing exceedingly bad.
It is fine to say you are having fun on your warlock, but don't try to extrapolate any further than that, because you are simply objectively wrong.